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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32a8dbfb386d6633b1f2b7ac19e92877eefa3fd23297d696bc6fdb423f81ddc' 
  AND token = '0oC2em+e22FP6KOaZMaNaF5hhBWtSIPMpY2h8Qx/s6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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