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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ac3c79415d495b7f47c4059cc86a66f96872b83aaaffec529aaadebf36be5' 
  AND token = 'Uqr2Bm+ruwNU34QgvCKFyeod4oqFpeVSFHvWf7nYFPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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