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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b0257a502edda951b19cdbc6e0f71d6a0096802f5962a77a860f31da4d1931' 
  AND token = 'hvx+9M+5dWmv2EH1MxrVAUdL/jeBwEiDGm5Q95/hP4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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