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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef7a6ab2928749076d053009272f46290ae27d80b28593ea9cfbafc9646821b' 
  AND token = 'HkLA3QX1GfL682GuGO7BfcIaNDiXNAUR7kmFXFIEAL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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