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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c6dcf0556ec2542887fb27015b1336fa0ce3a713ab94dd626326a376e18d47' 
  AND token = 'S4LOcmnSznMoaKVgb1y4YaIHx4moBx+HYjID0romjHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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