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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152404c973cf2508394cfc76ced58a2acbcaef6db5015af66033b983b6a13db5' 
  AND token = '1YJgXLLyELmbwiEhT3o6r5DE4kg95EIc3fGR8lBpuf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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