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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96865875f4e1db382d43cdb2936c82fc0713a6660a328d5b5267d20a023804a3' 
  AND token = 'gpCkxQm6AhJsib1ENkopwbBVeBJAsyP4Yy3+ZiB7nak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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