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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5469bdea2c6d9e013b6a5b86a7481fd443f293f03e8b2fefb098e7959484b36' 
  AND token = '/AhJJJxt53fNyNFycKqqFUBaQp11XZn7sRgaayjAAdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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