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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2fd8f679a5d31326ab70a3aeaa3bd693642c20c912457e9172c686d6f4fab7' 
  AND token = 'ceZQ97Qk5P0gCJtD1JUHdiWnXV4qUQZFftNm28+QrNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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