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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce717b5b5d535c422a0a35a63772045fb0f15015c12da251443dd216f130b3d' 
  AND token = 'Pg+WFW7Ci2WHp5sU8COf5e4c8Xb1IsqFjZEpL0vNksk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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