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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e086beb979e8f3741fbc75be9a2a62caf68d6c90dfe9c8a96143b1bec0037eb5' 
  AND token = '8z8YpiEfN1qY1lDli0djBVaU9MDL58mnDDKkoWcc7Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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