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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa6a596e6b06df6112c2059b1a2f50413050b00e42995fb94d73d1a00673b79' 
  AND token = 'j84JPoOFlW4g7LVnxDkRjW8PDIIwt0ta5UobPkB54UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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