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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2b0e0d2bb819a8c2ac27ca4b06bffb1e7b59c7c3917562d571c3c62f482b95' 
  AND token = 'MBBAT9UxchUBvmU8wS9hKh8Muq1KSFmQJPVA5ldDYe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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