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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bea67907797fb9a3148f9b2a54ec57cd247d08de96a440bee6f5928afc1a082' 
  AND token = 'S+KWstK9YT7VbAowIUhXySHspJ8jQ+TGNf9Ri5UG1Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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