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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cddc51f637a311c93233223e4e0207600f70508acf530a56cd7c6c90c673f0b' 
  AND token = 'fErp281yjWxxcZ7KwgKP9rlio5baY/ixcrN/xCng/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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