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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0e8d98a62f98759e98796e90f96f23ef536ffae74d0c37c02b001b7b672ac6' 
  AND token = 'nbzkSqTI/PQAvqiNJ96B3X616FNAkcLe1OenBj4DIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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