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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a76f45fe0e676147b06fb50e745e8bb5d86c99d3fdb0b3e63a4d21dd439b6c7' 
  AND token = 'Lr6/BGCidg7sVZ9hlEoGcimGBA7xj+HaBI4GlBsJeI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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