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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4aa2b4f91ae22e5718c7d51238a5dfaad7a18c8ce4a74c00bd6f5f4ad6372a' 
  AND token = 'WN00x0r71jvCT055dxK1jF2HYVzcQLpSQ3Z+P0NIxDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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