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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14a18d7e3feba58466ed7df1e639543a998c0b1726c23353a9afe80fc4a6546' 
  AND token = 'Pt3x4q3I1JZSCr+fbfZYyliwfVM6LYu2YGa2w4sTuq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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