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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e9c1df544c29eff028ee93f2ad570564a791376bf7e39cc6f7b47ed04f28df' 
  AND token = 'DUEphIwZ2oY+klFJJfOr1sdANscbuwjw09q6n48IOxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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