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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953c5b9556aa87cb5d658fe7bde958b52bedc4b175218ae7c727871ee68626eb' 
  AND token = 'JAxmaLip7oJ1QtPzciVyBKMOAoP2471wYo2vI811InM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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