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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8f8fddd26d991f7954c3f1a660b8cc545aff8c0a574e29af1efae98f505a43' 
  AND token = 'macD2ppJOlXYN6O3y8FKpSUsL4w1Z3i7w6WXkaunNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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