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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbad574dcf23c2601943152ff1d36e6c742a27283ba9994ca3e41f70e64b4a7' 
  AND token = 'SyeC6nL3niv9WR1fJrC3DUy6YPAuBytrRKASvXubh7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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