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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3d06b68dc0b1d424f91697bde981b23cf314b75bde490baac550159b3c5b1a' 
  AND token = 'P6hzYbsq2GpN2wij9l07OWDWiaCbEb5Z6R76MYr+hjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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