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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07df99b3e1e60cc0ef5e6210d550500d4ef615a0f7122a47e058de24523eded' 
  AND token = '52kh0A3le41ENFw04ZkK6PzxP2EnkamgDVkYFPiV1k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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