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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1fbe8c715e0f49b0617147d177562fb8a3381f469614889c8a51b823be5f86' 
  AND token = 'bfChR1LIwHahgzdrwuxLamCWq3h8dmpF3eHoVJLtZP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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