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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470de05602fc68cd72da3a5aeb01e304c31c66548b948cb7a61c8c7dbc397cbc' 
  AND token = 'TZe/r0vA+B2Fp+o00xxQ1+jytnJW/yb8kuOdOx7HW2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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