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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731bec4d2c990251ced09985f318496c549242d595f6989e8c1a4444e8ca7c92' 
  AND token = 'aOghPkjicgtDqe5C5NBE6EJDX+/S31dBPDCn77lhXDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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