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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926d051fef10b4e9a3f6e1e5c382c98e5abe5040531f4efd1dc1245aa1cdf00f' 
  AND token = 'qM8x0HWderwUVeQyFv10+ROd38nBqNdiBLbUM+4gPDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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