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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2597a39aa40b76e9b65e4319204624af7dba42f6f5d84876c8d7015893a6bd' 
  AND token = 'xe19QELDWXEMNCxk1hYBCRDGCygRGdVGMz4jh0fXl+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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