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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f92cfafae4f61e5a6fbb35b10dfc4c73908b63da13391416b745b48d872102' 
  AND token = 'X4sixp0qF3clshwLdAdW2Er/TOglmmk16k9xObW2Fv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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