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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d29c1767541aaf3178e04fe46d8eea921d38ca0487ad39c13195cebe0be549' 
  AND token = '/mVs5p38iSNJU/a8VvZR2Oqre9BlxLlqFRBjvBWr/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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