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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbdfeff5276bd9f1abde4644fccd05e0cd52be9fbf2bc4533250f869d80222e' 
  AND token = 'g/pJ94m8wzHDh2jQ9ksu4CGAE343j7JXoaSjxjcYntU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}