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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6ed165698155c11867b02f0799d57866c26740223c84ce51f8ad1787891dbe' 
  AND token = '2xohvNoRGAsqRP0UTLso55rF3e57QC6BM8vbnBHTVzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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