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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5f6a3d4d6a00628e9c326247320762d5b73b0b1171b135de92c364f25d766c' 
  AND token = 'rbb5Ng/j1QvX/Z6ZcfyH0kIDVy+Sb8lnxsfo+NyuXB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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