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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d697d01d999bf32f4ef6e5e001e4e59f73b7b650de2e189b0b5438e9ad3309e' 
  AND token = 'KBeqaSpRZNsFM2BvjB6Gm3VVhRItdRE/ankd5pLxkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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