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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d67faff15a9c0d299412e93c70b89211968db25be0af1974cad2fd8908e60fc' 
  AND token = '6RDZ6pSlgUgcQ3YHfKzdlbRXhl+TWLH1R8kzGBZ0nx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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