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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc53ab839dbccffa75137f9b439012f7628c67aff865b681aab94b7bace4743' 
  AND token = 'm1B6qk/c/5YhejLH2QHNdJteiS28I/cA4LeV1PAEbpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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