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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca1af502a67c1b045924ca7fe8b95640a511d24d2e1790f89d418eed23c0d9f' 
  AND token = 'ye9mjkE8L8C/gD/hXpqDL44GXt326qrHQxTDNyDvMdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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