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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac327ef41a6dddde49bbac4b4c34069936a423e970c8f746d618ea1aa819db81' 
  AND token = 'SGf4n/Yr+U93jfNKjuc6++v94c2qDdF2Ji14U7gbxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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