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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8949dc87662eab099e1d073755429bbee8a2233a1e9f828a53d69387c77f2ead' 
  AND token = '4b26Ukvh5af1RBC1Ch+bUaSdl/V12qDdrlQhuw9T1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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