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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402197f078be5dcd21c41eb4cb6237d612a609ed2062d33ccbf133fab42a17a6' 
  AND token = 'WIobL7cf+3Iw4RBa03CBtQY101W+vgQGnBQSFCgxtCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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