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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2b758919dee010c1d4ce3d088e07821ccb161948fb2edb02a2d52c30a54d2e' 
  AND token = 'hbzpBQq7DSp0mlihpfqfkJODmpQdaqLgI2nXHPRG2ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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