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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa00a2663a5d9c5970af0aa4f8ed00adc7fb85590a5e332c9232703b5631af3' 
  AND token = 'p5E+gIt6crenvYaLg5BtPRaRiVsS4o17866zVXHFM8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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