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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ff3830823c7a47e0d21ec17f705ecd9e5a13e1dad256388bb6890965bf151e' 
  AND token = '0n2elb0MeaDq2xIpEqr/WPfogNKMa1D2qrdoiNTSytw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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