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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e0ef11ab7da29a1d70c3fca5b25c18188a1ca2c7fd72e8d3763be1744e055e' 
  AND token = 'bV3GGeEg1CeWNzVu6YRpq/8LPpKEfE7hAbemKQqgPAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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