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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a7f8e1e20515bf1b7f3f760be735dc71ec21ed87c0b88cb5f95b3412a079e9' 
  AND token = 'v85yK1dHGaiwxX7fy8WajdQMcjFOteRZjWwVLCaQQHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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