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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1c70a4931dbf56e0f1e067bfc3dd5c3aacc35a7df352b35522e26e7eaae96d' 
  AND token = '+VuhkkHfzUibFaLITVmM0f/UpTBF8wk5z3aYNveljhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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