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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5a75ce0d967096ef02b55f897ecd917e1c67fc4d43b320b9d5388daeeb8f85' 
  AND token = 'iYvhRAFXfkt9CjGoV3Ox6NTZ8MA7tzFVy8mJOnAMONI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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