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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3036da5710850c0c5f08579d35ff7860eb42b2bbf7ecca2faff43dbe17a2f91' 
  AND token = 'LgH8+2/fYyoBe+hcygytU8jOItNF2cVRsTmeiP2mt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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