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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dc19794bd4b4013b71c47945409725ecc9e7e1a01ec12fc87a500bdb0b628a' 
  AND token = 'IV9aVuc1r/XceeJzAOy6m1h/ZMEED/pQo5XJBPYUY8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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