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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f408c7944ad37499683d9981e429d5d36a3a1d8d6fcf878168a9af3eb37fc2a3' 
  AND token = 'Ijq6kGXjaQAU1do5flsSZ7IXrkQ+8JSh9R+3PPngYa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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