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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697039def4bbad31c990525c38959700deb8479ca2d97efd048229f5f864ef71' 
  AND token = 'jLJtcRSVxDa4w+/sRoJrrEPmkB9+xcXNKj2BJEcTZGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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