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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44198e1f7d481c3aaf5f9f99abd4c6e2f5b9692ee5928c6c694cb3de35f78e24' 
  AND token = '0o57o33LbKeGJO1yIrDw5jVYsl20KmfVBKelYzdeM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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