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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb6aab64579ab7135cca703f5853867fe7a4f01a45a7ddef32e596e2cbfe661' 
  AND token = 'WFpqDJp03aq1vElmoune6gZoy+Aoi+Jg3WXFewHwRwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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